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Massive gene flow across the world's most potent marine biogeographic barrier

机译:跨越全球最强大的海洋生物地理屏​​障的大量基因流

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摘要

The 'Eastern Pacific Barrier' (EPB), 5400 km of uninterrupted deep water between the central and eastern Pacific, constitutes the greatest marine obstacle to the dispersal of shallow-water organisms. However, some species are found on both sides of the EPB. These 'transpacific' species are considered by 'dispersal' biogeographers as evidence of invasions through the barrier. 'Vicariance' biogeographers, on the other hand, think that transpacific species are morphologically conservative remnants of previously continuous distributions. We compared nucleotide sequences in a 642 bp region of mitochondrial DNA, and electrophoretically detected alleles in 17 enzymatic loci of central and eastern Pacific populations of Echinothrix diadema, an Indo-Pacific sea urchin recently reported from the eastern Pacific. Both types of molecules produced clear evidence of massive, recent gene flow across the EPB. Thus, rather than being isolated relicts of Tethyan distributions, conspecific populations from the eastern and central Pacific are genetically connected. Though the EPB is biogeographically important as a cause of speciation in many groups, it allows genetic connections in others, possibly through larval transport during El Niño events.
机译:“太平洋东部屏障”(EPB)是中部和东部太平洋之间5400公里的不间断深水,它是浅水生物扩散的最大海洋障碍。但是,在EPB的两侧都发现了一些物种。这些“跨太平洋”物种被“分散”生物地理学家认为是通过屏障入侵的证据。另一方面,“无差异”生物地理学家认为,跨太平洋物种是先前连续分布的形态保守的残余物。我们比较了线粒体DNA 642 bp区域中的核苷酸序列,并电泳检测了Echinothrix diadema的中部和东部太平洋种群的17个酶基因座中的等位基因,这是最近从东部太平洋报道的印度太平洋海胆。两种类型的分子都产生了明显的证据,表明整个EPB上存在大量的最新基因。因此,来自东部和中部太平洋的同种种群不是孤立的特提斯分布遗迹,而是遗传上的联系。尽管EPB在许多物种上在生物地理学上是造成物种形成的重要原因,但它可以通过厄尔尼诺事件期间的幼体运输与其他物种建立遗传联系。

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